Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 10 6 2010 10.5194/acp-10-2813-2010 http://www.atmos-chem-phys.net/10/2813/2010/ http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.html http://www.atmos-chem-phys.net/10/2813/2010/acp-10-2813-2010.pdf 2813 2824 2010-03-25 On retrieval of lidar extinction profiles using Two-Stream and Raman techniques I. S. Stachlewska iwona.stachlewska@igf.fuw.edu.pl C. Ritter Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany Institute of Geophysics, Faculty of Physics, University of Warsaw, Pasteura 7, 02-093 Warsaw, Poland The Two-Stream technique employs simultaneous measurements performed by two elastic backscatter lidars pointing at each other to sample into the same atmosphere. It allows for a direct retrieval of the extinction coefficient profile from the ratio of the two involved lidar signals. During a number of Alfred-Wegener-Institute (AWI) campaigns dedicated to Arctic research, the AWI's Polar 2 aircraft with the integrated onboard nadir-pointing Airborne Mobile Aerosol Lidar (AMALi) was utilised. The aircraft flew over a vicinity of Ny Ålesund on Svalbard, where the zenith-pointing Koldewey Aerosol Raman Lidar (KARL) has been located. This experimental approach gave the unique opportunity to retrieve the extinction profiles with a rarely used Two-Stream technique against a well established Raman technique. Both methods were applied to data obtained for clean Arctic conditions during the Arctic Study of Tropospheric clouds and Radiation (ASTAR 2004) campaign, and slightly polluted Arctic conditions during the Svalbard Experiment (SvalEx 2005) campaign. Successful comparison of both evaluation tools in different measurement conditions demonstrates sensitivity and feasibility of the Two-Stream method to obtain particle extinction and backscatter coefficients profiles without assumption of their relationship (lidar ratio). The method has the potential to serve as an extinction retrieval tool for KARL or AMALi simultaneous observations with the space borne CALIPSO lidar overpasses during the ASTAR 2007. Ackermann, J.: The extinction to backscatter ratio of tropospheric aerosol: A~numerical study, J. Atmos. Ocean. Technol., 15, 1043–1050, 1998. Ansmann, A., Riebesell, M., and Weitkamp, C.: Measurements of aerosol profiles with Raman lidar, Opt. Lett., 15, 746–748, 1990. Ansmann, A., Wandinger, U., Riebesell, M., Weitkamp, C., and Michaelis, W.: Independent measurements of extinction and backscatter profiles in Cirrus clouds by using a~combined Raman elastic-backscatter Lidar, Appl. Optics, 31, 7113–7131, 1992. Böckmann, C.: Hybrid regularisation method for ill-posed inversion of multiwavelength lidar data in the retrieval of aerosol size distribution, Appl. Optics, 40, 1329–1341, 2001. Böckmann, C. and Kirsche, A.: Iterative regularization method for lidar remote sensing, Comput. Phys. Commun., 174(8), 607–615, 2006. Chen, W., Chiang, C., and Nee, J.: Lidar Ratio and Depolarization Ratio for Cirrus Clouds, Appl. Optics, 41, 6470–6476, 2002. Cuesta, J. and Flamant, P. H.: Two-Stream lidar inversion algorithm for airborne and satellite validations, in: Proceedings of 22nd International Laser Radar Conference (IBC 2004), edited by: Pappalardo, G. and Amodeo, A., ESA SP-561, 1, 471–474, 2004. Dörnbrack, A., Stachlewska, I. S., Ritter, C., and Neuber, R.: Aerosol distribution around Svalbard during intense easterly winds, Atmos. Chem. Phys., 10, 1473–1490, 2010. Draxler, R. R. and Rolph, G. D.: HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) Model, Real-time Environmental Applications and Display sYstem (READY) Website http://www.arl.noaa.gov/ready/hysplit4.html, NOAA Air Resources Laboratory, Silver Spring, MD, 2003. Eloranta, E. W.: Practical Model for the Calculation of Multiply Scattered Lidar Returns, Appl. Optics, 37, 2464–2472, 1998. Eloranta, E. W. , Razenkov, I. A., and Garcia, J. P.: Arctic Observations with the University of Wisconsin High Spectral Resolution Lidar, in Reviewed and Revised Papers Presented at the 23rd International Laser Radar Conference, edited by: Nagasawa, C. and Sugimoto, N., pp. 399–402, 2006. Engvall, A.-C., Krejci, R., Ström, J., Minikin, A., Treffeisen, R., Stohl, A., and Herber, A.: In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summer, Tellus B, 60, 392–404, doi:10.1111/j.1600.0889.2008.00348.x, 2008. Fernald, F. G.: Analysis of atmospheric lidar observations: some comments, Appl. Optics, 23, 652–653, 1984. Gayet, J. F., Shcherbakov, V., Mannstein, H., Minikin, A., Schumann, U., Ström, J., Petzold, A., Ovarlez, J., and Immler, F.: Microphysical and optical properties of mid-latitude Cirrus Cloud observed in the southern hemisphere during INCA, Q. J. Roy. Meteorol. Soc., 132, 2791–2748, doi:10.1256/qj.05.162, 2006. Gayet, J.-F., Stachlewska, I. S., Jourdan, O., Shcherbakov, V., Schwarzenboeck, A., and Neuber, R.: Microphysical and optical properties of precipitating drizzle and ice particles obtained from alternated lidar and in situ measurements, Ann. Geophys., 25, 1487–1497, 2007. Garrett, T. J., Zhao, C., Dong, X., Mace, G. G., and Hobbs, P. V.: Effects of varying aerosol regimes on low-level Arctic stratus, Geophys. Res. Lett., 31, L17105, doi:10.1029/2004GL019928, 2004. Herber, A., Thomason, L. W., Gernandt, H., Leiterer, U., Nagel, D., Schulz, K.-H., Kaptur, J., Albrecht, T., and Notholt, J.: Continuous day and night aerosol optical depth observations in the Arctic between 1991 and 1999, J. Geophys. Res., 107(D10), 4097, doi:10.1029/2001JD000536, 2002. Hughes, H. G. and Paulson, M. R.: Double-ended lidar techniques for aerosol studies, Appl. Optics, 27, 2273–2278, 1988. Hoffmann, A., Ritter, C., Stock, M., Shiobara, M., Lampert, A., Maturilli, M., Orgis, T., Neuber, R., and Herber, A.: Ground-based lidar measurements from Ny-Ålesund during ASTAR 2007, Atmos. Chem. Phys., 9, 9059–9081, 2009. Immler, F., Treffeisen, R., Engelbart, D., Krüger, K., and Schrems, O.: Cirrus, contrails, and ice supersaturated regions in high pressure systems at northern mid latitudes, Atmos. Chem. Phys., 8, 1689–1699, 2008. Jörgensen, H. E., Mikkelsen, T., Streicher, J., Herrmann, H., Werner, C., and Lyck, E.: Lidar calibration experiments, Appl. Phys. B Lasers O., 64(3), 355–361, 1997. Klett, J. D.: Stable analytical inversion solution for processing lidar returns, Appl. Optics, 20, 211–220, 1981. Klett, J. D.: Lidar inversions with variable backscatter/extinction velues, Appl. Optics, 24, 211–220, 1985. Kovalev, V. A. and Eichinger, W. E.: Elastic Lidar: Theory, Practice, and Analysis Methods, J. Wiley & Sons, New York, ISBN 0-471-20171-5, 2004. Kunz, G. J.: Bipath Method as a~way to measure the spatial backscatter and extinction coefficients with lidar, Appl. Optics, 26, 794–795, 1987. Leiterer, U., Weller, M., and Janiak, J.: Verfahren zur Bestrahlungsstärke- und Strahldichtekalibrierung von Spektrometern, Patentschrift DD 228 631 A1, WP GO1 D/265 1067 v. 16.10., 1985. Liu, Z., Hunt, W., Vaughan, M., Hostetler, C., McGill, M., Powell, K. Winker, D., and Hu, Y.: Estimating random errors due to shot noise in backscatter lidar observations, Appl. Optics, 45, 4437–4447, 2006. Müller, D., Wandinger, U., and Ansmann, A.: Microphysical particle parameters from extinction and backscatter data by inversion with regularization, Appl. Optics, 38, 2358–2368, 1999. Müller, D., Ansmann, A., Mattis, I., Tesche, M., Wandinger, U., Althausen, D., and Pisani, G.: Aerosol-type-dependent lidar ratios observed with Raman lidar, J. Geophys. Res., 112, D16202, doi:10.1029/2006JD008292, 2007. Pinto, J. O., Curry, J. A., and Intrieri, J. M.: Cloud-aerosol interactions during autumn over Beaufort Sea, J. Geophys. Res., 106(D14), 15077–15097, 2001. Pornsawad, P., Böckmann, C., Ritter, C., and Rafler, M.: Ill-posed retrieval of aerosol extinction coefficient profiles from Raman lidar data by regularization, Appl. Optics, 47, 1649–1661, 2008. Reichardt, J., Reichardt, S., Behrendt, A., and McGee, T. J.: Correlations among the optical properties of Cirrus-cloud particles: Implications for space borne remote sensing, Geophys. Res. Lett., 29(14), 1668, doi:10.1029/2002GL014836, 2002. Ritter, C., Kirsche, A., and Neuber, R.: Tropospheric Aerosol Characterized by a~Raman Lidar over Spitsbergen, in: Proceedings of 22nd International Laser Radar Conference (ILRC 2004 in Matera, Italy), edited by: Pappalardo, G. and Amodeo, A., ESA SP-561, 1, 459–462, ISBN 92-9092-872-7, 2004. Ritter, C., Stachlewska, I. S., and Neuber, R.: Application of the Two-Stream evaluation for a~case study of Arctic Haze over Spitsbergen, in: Proceedings of 23nd International Laser Radar Conference (ILRC 2006 in Nara, Japan), edited by: Nagasawa, C. and Sugimoto, N., 1, 507–510, ISBN 4-9902916-0-3, 2006. Ritter, C., Hoffmann, A., Osterloh, L., and Böckmann, C.: Estimation of the Liquid Water Content of a~low-level Arctic winter cloud, in: Proceedings of 24nd International Laser Radar Conference (ILRC 2008 in Boulder, Colorado, USA), 1, 579–582, ISBN 978-0-615-21489-4, 2008. Sasano, Y., Browell, E. V., and Ismail, S.: Error caused by using a~constant extinction/backscattering ratio in the lidar solution, Appl. Optics, 24, 3929–3932, 1985. Sassen, K. and Comstock, J. M.: A midlatitude Cirrus cloud climatology from the facility for atmospheric remote sensing. Part III: Radiative properties, J. Atmos. Sci., 58 , 2113–2127, 2001. Shaw, G. E.: Sun Photometry, B. Am. Meteorol. Soc., 64, 4–10, 1983. Stachlewska, I. S., Wehrle, G., Stein, B., and Neuber, R.: Airborne Mobile Aerosol Lidar for measurements of Arctic aerosols, in: Proceedings of 22nd International Laser Radar Conference (ILRC 2004), edited by: Pappalardo, G. and Amodeo, A., ESA SP-561, 1, 87–89, 2004. Stachlewska, I. S., Ritter, C., and Neuber, R.: Application of the Two-Stream inversion algorithm for retrieval of extinction, backscatter and lidar ratio for clean and polluted Arctic air, in: Proceedings of SPIE, 5584, 03/1–03/8, 2005. Stachlewska, I. S.: Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique, PhD Thesis, University of Potsdam, http://opus.kobv.de/ubp/volltexte/2006/698/, 2006a. Stachlewska, I. S., Gayet, J.-F., Duroure, C., Schwarzenboeck, A., Jourdan, O., Shcherbakov, V., and Neuber, R.: Observations of mixed-phase clouds using airborne lidar and in-situ instrumentation, in: Reviewed and Revised Papers Presented at the 23rd International Laser Radar Conference (ILRC~2006), 1, 325–328, 2006b. Stachlewska, I. S., Neuber, R., Lampert, A., Ritter, C., and Wehrle, G.: AMALi – the Airborne Mobile Aerosol Lidar for Arctic research, Atmos. Chem. Phys. Discuss., 9, 18745–18792, 2009. Treffeisen, R., Krejci, R., Ström, J., Engvall, A. C., Herber, A., and Thomason, L.: Humidity observations in the Arctic troposphere over Ny-Ålesund, Svalbard based on 15 years of radiosonde data, Atmos. Chem. Phys., 7, 2721–2732, 2007. Veselovskii, I., Kologotin, A., Griazanow, V., Müller, D., and Whitemann, D.: Inversion with regularization for the retrieval of tropospheric aerosol parameters from multiwavelength lidar sounding, Appl. Optics, 18, 3685–3699, 2002. Wang, X., Frontoso, M. G., Pisani, G., and Spinelli, N.: Retrieval of atmospheric particles optical properties by combining ground based and space borne lidar elastic scattering profiles, Opt. Express, 15, 6734–6743, 2007. Winker, D. M., Hunt, B. H., and McGill, M. J.: Initial performance assessment of CALIOP, Geophys. Res. Lett., 34, L19803, doi:10.1029/2007GL030135, 2007.